package com.concurrent.sync;

import com.concurrent.annotations.NotThreadSafe;
import com.concurrent.annotations.ThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

/**
 * @author: zhouyang
 * @descrpition:
 * @time: 2019-05-03 23:40
 */
@ThreadSafe
@Slf4j
//用synchronized修饰
public class SynchronizedCount {
    //请求总数
    public static int clientTotal = 5000;

    //请求并行的线程数
    public static int threadTotal = 200;

    private static int count = 0;

    public static void main(String[] args) throws Exception{
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);//请求总数
        for(int i=0;i<clientTotal;++i){
            executorService.execute(()->{
                try {
                    semaphore.acquire();
                    add();
                    semaphore.release();
                }catch (Exception e){

                }
                countDownLatch.countDown();
            });
        }
        countDownLatch.await();
        executorService.shutdown();
        log.info("count:{}",count);
    }

    private synchronized static void add(){
        count++;
    }
}
